Elements of
Chemical Reaction Engineering
6th Edition



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Essentials of
Chemical Reaction Engineering
Second Edition

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Chapter 8: Multiple Reactions

Concentration-Time Trajectories



1. The following concentration-time trajectories were observed in a batch reactor



Which of the following reaction pathways best describes the data:

 

Solution













2. Sketch the concentration-time trajectory for the reaction:


Solution


 

 

 

 

 

 

Solution: Part 1

Choice B is the answer. Choices A and C are incorrect because they show species B eventually consumed, which is clearly not the case.

Back to Problem 1

Problem 2


































Solution: Part 2

(1) B virtually consumed so no more D can be produced in reaction 2.      

(2) Rates of Consumption of A and Ba are virtually the same.                   

(3) Rate of consumption of B greater than that of A owing to Reaction 2.

Below is the polymath code typed in to produce the graph above.



Back to Problem 2

Back to Chapter 8